I have a Nobsound USB isolator between the two now, and the sound is clear and no hiss, except where recorded.
I'm listening to Everything but the girl, I don't want to talk about it, and the electric guitars are thrumming, and a repeated deep bass note is evident that was not distinct before.
This is as good as the Pioneer CD player which in turn is better than LMS sound.
Reading reviews of the isolator, it serves up to USB 2.0, not high speed. It may add artifacts if it is used in an inappropriate context.